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The annual birth rate and death rate per 1000 are 39.4 and 19.4 respectively. The number of years in which population will be doubled assuming that there is no immigration or emigration is approximately
  • a)
    40 years 
  • b)
    30 years
  • c)
    36 years
  • d)
    25 years
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The annual birth rate and death rate per 1000 are 39.4 and 19.4 respec...
Calculation of Population Growth Rate:

1. The annual birth rate per 1000 is 39.4, which means that per year, 39.4 people are born for every 1000 people in the population.
2. The annual death rate per 1000 is 19.4, which means that per year, 19.4 people die for every 1000 people in the population.
3. The difference between the birth rate and death rate is the natural population growth rate, which is 20 (39.4 - 19.4).
4. To calculate the population growth rate, we use the formula: (natural population growth rate / 1000) x current population.

Calculation of Years to Double Population:

1. The formula to calculate the years to double the population is: 70 / (population growth rate).
2. Substituting the population growth rate of 20 in the formula, we get: 70 / 20 = 3.5 years to double the population.
3. However, this formula assumes continuous and constant population growth, which is not the case in reality. Therefore, we use the rule of 70, which provides a more accurate estimate.
4. The rule of 70 states that if we divide 70 by the population growth rate, we get the approximate number of years it takes for the population to double.
5. Substituting the population growth rate of 20 in the formula, we get: 70 / 20 = 3.5.
6. Therefore, it will take approximately 36 years (3.5 x 10) for the population to double, assuming there is no immigration or emigration.
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The annual birth rate and death rate per 1000 are 39.4 and 19.4 respectively. The number of years in which population will be doubled assuming that there is no immigration or emigration is approximatelya)40 yearsb)30 yearsc)36 yearsd)25 yearsCorrect answer is option 'C'. Can you explain this answer?
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